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1. Why do you do no work on a 25- kg backpack when you walk a horizontal distance of 100 mm?
2. The Sun puts out twice as much solar energy in 2 hours as it does in 1 hour. But the solar power of the Sun is the same from one hour to the next. Distinguish between the terms solar energy and solar power.
3. Someone wanting to sell you a Superball claims that it will bounce to a height greater than the height from which it is dropped. Can this be?
4. What famous equation describes the relationship between mass and energy?
5. If two objects have equal kinetic energies, do they necessarily have the same momentum? Defend your answer.
A helicopter has two blades, each of which has a mass of 270 kg and can be approximated as a thin rod of length 6.7 m. The blades are rotating at an angular speed of 54 rad/s. (a) What is the total moment of inertia of the two blades about the axis o..
A meteor streaking through the night sky is located with radar. At point A its coordinates are (5.40km, 1.25km ), Find the magnitude of its average velocity between these two points
two particals collide head on elastically. one particle has a mass m and initial speed v while the second partticleshas
If the gauge pressure of the blood at your heart is 13.25 kPa and your body doesn't compensate, what would the pressure be at your head, 57.4 cm above your heart
A 70 kg meteorite buries itself 5.5m into soft mud. The force between meteorite and the mud is given by F(x) = (680 N/m^3)x^3, where x is the depth in the mud. What was the speed of the meteorite when it firstly impacted the mud.
A generator uses a coil that has 390 turns and a 0.65-T magnetic field. The frequency of this generator is 60.0 Hz, determine the length of the wire from which the coil is made
The front 1.20 m of a 1,350-kg car is designed as a "crumple zone" that collapses to absorb the shock of a collision. What is the magnitude of the average force on the car
In a certain binary-star system, each star has the same mass whichis 1.6 times of that of the Sun, and they revolve about theircenter of mass. What is their period of revolution in years
A spotlight on a boat is 2.5 m above the water, and the light strikes the water at a point that is 8.0 m horizontally displaced from the spotlight (see the drawing). The depth of the water is 4.0m. Decide the distance d, which locates the point where..
Suppose that you hear a clap of thunder 16.2s after seeing theassociated lightning stroke. How far are you from the lightning stroke
Two parallel plate capacitors of area 10.0 cm2 are placed a distance of 2.00mm away from each other and filled with a fluid that gives a capacitance of 10-10 F. What is the force on that electron when it is 0.667mm from the positive plate
Platinum has a work function of 6.4 eV. Radiation with wavelength 150 nm and intensity 1.3 W/m2 is directed at a platinum surface. (a) Discover the maximum kinetic energy of the ejected electrons. (b) If 1.0% of the photons striking a1.0 cm2 area of ..
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